Covers all Yamaha/Mercury & Mariner 2. 5 - 225 hp 1-4 Cylinder, V4 and V6 4-Stroke Models, including Jet Drives. Only Seloc manuals include Skill level Ratings (1 - 4 wrenches) based upon the degree of difficulty along with Special Tool icons where a OEM or electronic testing tool is required to perform the specified procedure.